Several miRNAs have been described, extensively studied and their regulatory role in gene expression been established. miRNA, a 21–24 nucleotide RNA product of a non-protein-coding gene, controls expression of diverse set of genes in response to intrinsic or extrinsic signals. Conserved miRNAs are considered to play important roles in basic organogenesis or signal transduction, while non-conserved miRNAs may play more specific roles in different tissues or plant species. Plant growth and development is regulated by various miRNA families. Loss of function studies on miR159, miR165/miR166, miR319, miR164 greatly affects reproductive development, organ polarity, phase transition, boundary formation and other features associated with plant growth. An essential phytohormone, auxin is regulated by a group of miRNA that target TAAR genes. miR393 dependent biogenesis of secondary siRNA, creates a network that regulates TAAR and other unrelated genes. miRNAs are implicated in stress response signaling, assisting plants to adapt themselves to the changing environment. miR168, the most common stress inducible gene, is highly expressed when the plant is subjected to cold, drought, salinity and ABA stress. Here we have reviewed the role of miRNAs as signaling molecules regulating gene networks in plant development and its response to adverse environment.
Name of the Student : Muriel Monteiro
Reg No: 1741210005
Batch: M.Tech II Year
Name of the Guide : Mr. Rex Arunraj